Table 2: The wavenumber and the assignment of vibration of BSL.

Wavenumber (cm−1)Assignment of vibration

3339O-H asymmetric stretching vibration
3082, 2988Aromatic C-H stretching vibration
1620C=O vibration of Salicylate
1592, 1478, 1451, and 1380Aromatic C=C stretching vibration
1244C-O stretching vibration
1139C-H inplane bending vibration
1029, 932C-N stretching vibration
766C-H out of plane bending